The Talon of God

This is an optional objective, but you should definitely talk to Tannis, Zed, Moxxi, Scooter and the rest of the named crew in Sanctuary. You'll receive lots of cool loot for doing so. Note that once you talk to Claptrap, the mission gets underway and you can no longer get the items from them.

When you're in the Hero's Pass area, look for a loot/ammo area protected by an energy shield on the way. Follow the cables along the path (it's pretty far) until you see a cable veer off to a rocky ledge. Walk along the ledge to find a fuse box and turn it off, then return for the loot.

As you continue on, you will encounter a Constructor, Super Badass Loader, and a Badass Constructor.

Collect all the loot. There will be lots, including (perhaps) the Conference Call Legendary Shotgun or the Volcano Legendary Sniper Rifle. If this is your FIRST time killing the Warrior (via moonshot) you will get a Legendary item 100% of the time. After that, the drop rate reverts to the rest of the game, though The Warrior has a *VERY* miniscule increase over a base enemy/normal chest of dropping a Legendary.